/*! @file sreadrb.c
* \brief Read a matrix stored in Rutherford-Boeing format
*
* <pre>
* -- SuperLU routine (version 4.0) --
* Lawrence Berkeley National Laboratory.
* June 30, 2009
* </pre>
*
* Purpose
* =======
*
* Read a FLOAT PRECISION matrix stored in Rutherford-Boeing format
* as described below.
*
* Line 1 (A72, A8)
* Col. 1 - 72 Title (TITLE)
* Col. 73 - 80 Matrix name / identifier (MTRXID)
*
* Line 2 (I14, 3(1X, I13))
* Col. 1 - 14 Total number of lines excluding header (TOTCRD)
* Col. 16 - 28 Number of lines for pointers (PTRCRD)
* Col. 30 - 42 Number of lines for row (or variable) indices (INDCRD)
* Col. 44 - 56 Number of lines for numerical values (VALCRD)
*
* Line 3 (A3, 11X, 4(1X, I13))
* Col. 1 - 3 Matrix type (see below) (MXTYPE)
* Col. 15 - 28 Compressed Column: Number of rows (NROW)
* Elemental: Largest integer used to index variable (MVAR)
* Col. 30 - 42 Compressed Column: Number of columns (NCOL)
* Elemental: Number of element matrices (NELT)
* Col. 44 - 56 Compressed Column: Number of entries (NNZERO)
* Elemental: Number of variable indeces (NVARIX)
* Col. 58 - 70 Compressed Column: Unused, explicitly zero
* Elemental: Number of elemental matrix entries (NELTVL)
*
* Line 4 (2A16, A20)
* Col. 1 - 16 Fortran format for pointers (PTRFMT)
* Col. 17 - 32 Fortran format for row (or variable) indices (INDFMT)
* Col. 33 - 52 Fortran format for numerical values of coefficient matrix
* (VALFMT)
* (blank in the case of matrix patterns)
*
* The three character type field on line 3 describes the matrix type.
* The following table lists the permitted values for each of the three
* characters. As an example of the type field, RSA denotes that the matrix
* is real, symmetric, and assembled.
*
* First Character:
* R Real matrix
* C Complex matrix
* I integer matrix
* P Pattern only (no numerical values supplied)
* Q Pattern only (numerical values supplied in associated auxiliary value
* file)
*
* Second Character:
* S Symmetric
* U Unsymmetric
* H Hermitian
* Z Skew symmetric
* R Rectangular
*
* Third Character:
* A Compressed column form
* E Elemental form
*
* </pre>
*/
#include "slu_sdefs.h"
/*! \brief Eat up the rest of the current line */
static int sDumpLine(FILE *fp)
{
register int c;
while ((c = fgetc(fp)) != '\n') ;
return 0;
}
static int sParseIntFormat(char *buf, int *num, int *size)
{
char *tmp;
tmp = buf;
while (*tmp++ != '(') ;
sscanf(tmp, "%d", num);
while (*tmp != 'I' && *tmp != 'i') ++tmp;
++tmp;
sscanf(tmp, "%d", size);
return 0;
}
static int sParseFloatFormat(char *buf, int *num, int *size)
{
char *tmp, *period;
tmp = buf;
while (*tmp++ != '(') ;
*num = atoi(tmp); /*sscanf(tmp, "%d", num);*/
while (*tmp != 'E' && *tmp != 'e' && *tmp != 'D' && *tmp != 'd'
&& *tmp != 'F' && *tmp != 'f') {
/* May find kP before nE/nD/nF, like (1P6F13.6). In this case the
num picked up refers to P, which should be skipped. */
if (*tmp=='p' || *tmp=='P') {
++tmp;
*num = atoi(tmp); /*sscanf(tmp, "%d", num);*/
} else {
++tmp;
}
}
++tmp;
period = tmp;
while (*period != '.' && *period != ')') ++period ;
*period = '\0';
*size = atoi(tmp); /*sscanf(tmp, "%2d", size);*/
return 0;
}
static int ReadVector(FILE *fp, int n, int *where, int perline, int persize)
{
register int i, j, item;
char tmp, buf[100];
i = 0;
while (i < n) {
fgets(buf, 100, fp); /* read a line at a time */
for (j=0; j<perline && i<n; j++) {
tmp = buf[(j+1)*persize]; /* save the char at that place */
buf[(j+1)*persize] = 0; /* null terminate */
item = atoi(&buf[j*persize]);
buf[(j+1)*persize] = tmp; /* recover the char at that place */
where[i++] = item - 1;
}
}
return 0;
}
static int sReadValues(FILE *fp, int n, float *destination, int perline,
int persize)
{
register int i, j, k, s;
char tmp, buf[100];
i = 0;
while (i < n) {
fgets(buf, 100, fp); /* read a line at a time */
for (j=0; j<perline && i<n; j++) {
tmp = buf[(j+1)*persize]; /* save the char at that place */
buf[(j+1)*persize] = 0; /* null terminate */
s = j*persize;
for (k = 0; k < persize; ++k) /* No D_ format in C */
if ( buf[s+k] == 'D' || buf[s+k] == 'd' ) buf[s+k] = 'E';
destination[i++] = atof(&buf[s]);
buf[(j+1)*persize] = tmp; /* recover the char at that place */
}
}
return 0;
}
void
sreadrb(int *nrow, int *ncol, int *nonz,
float **nzval, int **rowind, int **colptr)
{
register int i, numer_lines = 0;
int tmp, colnum, colsize, rownum, rowsize, valnum, valsize;
char buf[100], type[4];
FILE *fp;
fp = stdin;
/* Line 1 */
fgets(buf, 100, fp);
fputs(buf, stdout);
/* Line 2 */
for (i=0; i<4; i++) {
fscanf(fp, "%14c", buf); buf[14] = 0;
sscanf(buf, "%d", &tmp);
if (i == 3) numer_lines = tmp;
}
sDumpLine(fp);
/* Line 3 */
fscanf(fp, "%3c", type);
fscanf(fp, "%11c", buf); /* pad */
type[3] = 0;
#ifdef DEBUG
printf("Matrix type %s\n", type);
#endif
fscanf(fp, "%14c", buf); sscanf(buf, "%d", nrow);
fscanf(fp, "%14c", buf); sscanf(buf, "%d", ncol);
fscanf(fp, "%14c", buf); sscanf(buf, "%d", nonz);
fscanf(fp, "%14c", buf); sscanf(buf, "%d", &tmp);
if (tmp != 0)
printf("This is not an assembled matrix!\n");
if (*nrow != *ncol)
printf("Matrix is not square.\n");
sDumpLine(fp);
/* Allocate storage for the three arrays ( nzval, rowind, colptr ) */
sallocateA(*ncol, *nonz, nzval, rowind, colptr);
/* Line 4: format statement */
fscanf(fp, "%16c", buf);
sParseIntFormat(buf, &colnum, &colsize);
fscanf(fp, "%16c", buf);
sParseIntFormat(buf, &rownum, &rowsize);
fscanf(fp, "%20c", buf);
sParseFloatFormat(buf, &valnum, &valsize);
sDumpLine(fp);
#ifdef DEBUG
printf("%d rows, %d nonzeros\n", *nrow, *nonz);
printf("colnum %d, colsize %d\n", colnum, colsize);
printf("rownum %d, rowsize %d\n", rownum, rowsize);
printf("valnum %d, valsize %d\n", valnum, valsize);
#endif
ReadVector(fp, *ncol+1, *colptr, colnum, colsize);
ReadVector(fp, *nonz, *rowind, rownum, rowsize);
if ( numer_lines ) {
sReadValues(fp, *nonz, *nzval, valnum, valsize);
}
fclose(fp);
}